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I was surprised when I read that each PPSH-41 had 2X drum mags matched and serial numbered to it because I had assumed that the Soviets designed it to use any PPSH-41 drum mag without issues.There...

There is good old Wikipedia, of-course, but not everyone is a fan. Unless anyone can produce a better list, it is the best one that I know of.

PPSh-41 - Wikipedia

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Mentioned briefly in this article below. I did see it mentioned elsewhere which I can't currently find.

ROMARM Small Arms Factories

Romania





This is quite interesting about Iranian production: Iranian PPSh-41 Production During the Second World War | Silah Report